LTC3728L/LTC3728LX
38
3728lxff
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2002
LT 1211 REV F • PRINTED IN USA
relaTeD parTs
Typical applicaTion
Figure 14. Multioutput PolyPhase
®
Application
PHASMD
CLKOUT
TG1
TG2
0°
I
1
I
3
I
2
I
4
90°
OPEN
180°
U1
LTC3729
BUCK: 2.5V/15A
BUCK: 2.5V/15A
PLLIN
TG1
TG2
90°
90°
270°
U2
LTC3728L/
LTC3728LX
BUCK: 1.5V/15A
2.5V
O
/30A
C
IN
I
IN
12V
IN
*INPUT RIPPLE CURRENT CANCELLATION
INCREASES THE RIPPLE FREQUENCY AND
REDUCES THE RMS INPUT RIPPLE CURRENT
THUS, SAVING INPUT CAPACITORS
I
IN
*
1.5V
O
/15A
1.8V
O
/15A
3728 F14
BUCK: 1.8V/15A
I
1
I
2
I
3
I
4
PART NUMBER DESCRIPTION COMMENTS
LTC3880/LTC3880-1 Dual Output PolyPhase Step-Down DC/DC Controller with
Digital Power System Management
I
2
C/PMBus Interface with EEPROM and 16-Bit ADC
V
IN
Up to 24V, 0.5V ≤ V
OUT
≤ 5.5V, Analog Control Loop
LTC3869/LTC3869-2 Dual Output, 2-Phase Synchronous Step-Down DC/DC Controller,
with Accurate Current Share
PLL Fixed 250kHz to 750kHz Frequency, 4V ≤ V
IN
≤ 38V,
0.6V ≤ V
OUT
≤ 12.5V
LTC3855 Dual Output, 2-Phase, Synchronous Step-Down DC/DC Controller
with Differential Amplifier and DCR Temperature Compensation
PLL Fixed Frequency 250kHz to 770kHz, 4.5V ≤ V
IN
≤ 38V,
0.8V ≤ V
OUT
≤ 12V
LTC3838 Dual, Multiphase, Controlled On-Time, High Frequency
Synchronous Step-Down Controller with Differential Amplifier
Up to 2MHz Operating Frequency, 4V ≤ V
IN
≤ 38V,
0.8V ≤ V
OUT
≤ 5.5V, 3mm × 4mm QFN-20, TSSOP-20E
LTC3860 Dual, Multiphase, Synchronous Step-Down DC/DC Controller with
Differential Amplifier and Three-State Output Drive
Operates with Power Blocks, DRMOS Devices or
External Drivers/MOSFETs, 3V ≤ V
IN
≤ 24V, t
ON(MIN)
= 20ns
LTC3850/LTC3850-1/
LTC3850-2
Dual Output, 2-Phase Synchronous Step-Down DC/DC Controller,
R
SENSE
or DCR Current Sensing
PLL Fixed 250kHz to 780kHz Frequency, 4V ≤ V
IN
≤ 30V,
0.8V ≤ V
OUT
≤ 5.25V
LTC3856 Single Output 2-Channel Synchronous Step-Down DC/DC
Controller with Differential Amplifier and Up to 12-Phase Operation
PLL Fixed 250kHz to 770kHz Frequency, 4.5V ≤ V
IN
≤ 38V,
0.8V ≤ V
OUT
≤ 5V
LTC3829 Single Output 3-Channel Synchronous Step-Down DC/DC
Controller with Differential Amplifier and Up to 6-Phase Operation
Phase-Lockable Fixed 250kHz to 770kHz Frequency,
4.5V ≤ V
IN
≤ 38V, 0.8V ≤ V
OUT
≤ 5V
LTC3853 Triple Output, Multiphase Synchronous Step-Down DC/DC
Controller, R
SENSE
or DCR Current Sensing and Tracking
PLL Fixed 250kHz to 750kHz Frequency, 4V ≤ V
IN
≤ 24V,
V
OUT3
Up to 13.5V
